The last CentOS upgrade from December 3, 2015 rpmsaved the
/etc/yum/yum-cron.conf file and replaced it with the new one on bunch of the servers I manage, which had previously been configured with the following settings in the file:
update_messages = no apply_updates = yes
to let all the systems auto-upgrade without sending notification messages. Unfortunately, both settings have been reversed by the last upgrade and my e-mail box is full of annoying notifications.
Now, before proceeding to set desired settings on all the servers once from anew again, I'd like to know how to prevent this kind of issues in the future. I don't mind the yum-cron.conf file to be upgraded if required, but with my custom settings preserved. So what is the best way of addressing this issue?